consolidated: recover closed-unmerged PR #1108 - template-switching permission notices and switch_template AJAX

[superdav42]

Supersedes #1131 — this issue is the consolidated spec.

What

Recover the valuable code from closed-unmerged PR #1108 ("fix: render permission state notices on template-switching page and authorize switch_template AJAX"). Either reopen the original PR if its branch still exists and the work remains valid, or cherry-pick/recreate the valuable changes in a fresh PR. If the work is obsolete or unsafe, document the evidence and close with rationale.

Why

• Problem: PR fix: render permission state notices on template-switching page and authorize switch_template AJAX #1108 was closed without being merged, but contains valuable code fixes for the template-switching page permission state notices and AJAX authorization.
• Risk: medium
• Rationale: The pulse prefetch flagged this PR as containing recoverable code and no open replacement PR exists. Losing these fixes means the template-switching page may not properly render permission state notices or authorize the switch_template AJAX action.

How

1. Inspect PR fix: render permission state notices on template-switching page and authorize switch_template AJAX #1108 — review its diff, review comments, CI history, and linked issues to understand what changes were proposed.
2. Check if branch still exists — verify whether the original branch from PR fix: render permission state notices on template-switching page and authorize switch_template AJAX #1108 is still available in the repository.
3. If branch exists and work is valid: Reopen the original PR fix: render permission state notices on template-switching page and authorize switch_template AJAX #1108.
4. If branch deleted or stale: Create a fresh branch from the default branch and hand-apply/cherry-pick only the still-valid changes.
5. Verification: Run the repo-relevant lint/test/build commands affected by the recovered files.
   • Run npm run check (lint + phpstan + phpunit)
   • Run relevant gateway and template-switching tests

Note: Paths are not known until the PR diff is inspected. This is a salvage/recovery task, not a blind merge. Do not apply reviewer suggestions blindly — inspect and verify each change before applying.

Acceptance Criteria

• PR fix: render permission state notices on template-switching page and authorize switch_template AJAX #1108 diff reviewed and changes understood
• Original branch availability checked
• Either reopened original PR or created fresh branch with valid changes
• Verification tests pass (lint + tests)
• PR body links this issue and source PR fix: render permission state notices on template-switching page and authorize switch_template AJAX #1108, summarizes what was recovered vs intentionally omitted
• If work is obsolete/unsafe, documented evidence and issue closed with rationale

Context & Decisions

• The parent issue Recover closed-unmerged PR #1108: fix: render permission state notices on template-switching page and authorize switch_template AJAX #1131 was created to recover valuable code from closed-unmerged PR fix: render permission state notices on template-switching page and authorize switch_template AJAX #1108.
• Two escalation attempts failed due to missing implementation context (file paths not known until PR inspection).
• No substantive comments added clarifications or constraints — the parent body itself contains the full scope.

Contributors

cc: @superdav42

[superdav42]

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